{"id":43453,"date":"2025-06-12T15:28:31","date_gmt":"2025-06-12T07:28:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/43453.html"},"modified":"2025-06-12T15:28:31","modified_gmt":"2025-06-12T07:28:31","slug":"javaweb%e6%9c%9f%e6%9c%ab%e9%80%9f%e6%88%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/43453.html","title":{"rendered":"JavaWeb\u671f\u672b\u901f\u6210"},"content":{"rendered":"

\u5173\u952e\u8bcd： MVC \u3001Servlet \u3001 EL\u8868\u8fbe\u5f0f \u3001 Session \u3001 \u4f5c\u7528\u57df(Scope) \u3001 \u8868\u5355 \u3001 doGet() \u3001request \u3001 JSP \u3001 \u8f6c\u53d1\u4e0e\u91cd\u5b9a\u5411<\/p>\n

\n

MVC<\/h3>\n

MVC\u57fa\u672c\u6982\u5ff5<\/h4>\n

MVC（Model-View-Controller）\u662f\u4e00\u79cd\u8f6f\u4ef6\u67b6\u6784\u6a21\u5f0f，\u5c06\u5e94\u7528\u7a0b\u5e8f\u5206\u4e3a\u4e09\u4e2a\u6838\u5fc3\u7ec4\u4ef6：<\/p>\n\n\u7ec4\u4ef6\u8bf4\u660e<\/tr>\n\n\n\n\n
Model<\/td>\n\u5904\u7406\u4e1a\u52a1\u903b\u8f91\u548c\u6570\u636e\u6301\u4e45\u5316，\u4ee3\u8868\u5e94\u7528\u7a0b\u5e8f\u7684\u6570\u636e\u548c\u4e1a\u52a1\u89c4\u5219<\/td>\n<\/tr>\n
View<\/td>\n\u7528\u6237\u754c\u9762\u5c42，\u8d1f\u8d23\u6570\u636e\u7684\u5c55\u793a\u548c\u7528\u6237\u4ea4\u4e92<\/td>\n<\/tr>\n
Controller<\/td>\n\u63a5\u6536\u7528\u6237\u8f93\u5165，\u534f\u8c03Model\u548cView\u4e4b\u95f4\u7684\u4ea4\u4e92<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

MVC\u5de5\u4f5c\u6d41\u7a0b<\/h4>\n

#mermaid-svg-NLTgagURCBIwtNVA {font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-NLTgagURCBIwtNVA .error-icon{fill:#552222;}#mermaid-svg-NLTgagURCBIwtNVA .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-NLTgagURCBIwtNVA .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-NLTgagURCBIwtNVA .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-NLTgagURCBIwtNVA .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-NLTgagURCBIwtNVA .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-NLTgagURCBIwtNVA .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-NLTgagURCBIwtNVA .marker{fill:#333333;stroke:#333333;}#mermaid-svg-NLTgagURCBIwtNVA .marker.cross{stroke:#333333;}#mermaid-svg-NLTgagURCBIwtNVA svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-NLTgagURCBIwtNVA .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-NLTgagURCBIwtNVA text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-NLTgagURCBIwtNVA .actor-line{stroke:grey;}#mermaid-svg-NLTgagURCBIwtNVA .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-NLTgagURCBIwtNVA .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-NLTgagURCBIwtNVA #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-NLTgagURCBIwtNVA .sequenceNumber{fill:white;}#mermaid-svg-NLTgagURCBIwtNVA #sequencenumber{fill:#333;}#mermaid-svg-NLTgagURCBIwtNVA #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-NLTgagURCBIwtNVA .messageText{fill:#333;stroke:#333;}#mermaid-svg-NLTgagURCBIwtNVA .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-NLTgagURCBIwtNVA .labelText,#mermaid-svg-NLTgagURCBIwtNVA .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-NLTgagURCBIwtNVA .loopText,#mermaid-svg-NLTgagURCBIwtNVA .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-NLTgagURCBIwtNVA .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-NLTgagURCBIwtNVA .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-NLTgagURCBIwtNVA .noteText,#mermaid-svg-NLTgagURCBIwtNVA .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-NLTgagURCBIwtNVA .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-NLTgagURCBIwtNVA .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-NLTgagURCBIwtNVA .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-NLTgagURCBIwtNVA .actorPopupMenu{position:absolute;}#mermaid-svg-NLTgagURCBIwtNVA .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 \/ 0.4));}#mermaid-svg-NLTgagURCBIwtNVA .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-NLTgagURCBIwtNVA .actor-man circle,#mermaid-svg-NLTgagURCBIwtNVA line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-NLTgagURCBIwtNVA :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;} <\/p>\n

User <\/p>\n

Controller <\/p>\n

Model <\/p>\n

View <\/p>\n

\u53d1\u8d77HTTP\u8bf7\u6c42 <\/p>\n

\u8c03\u7528\u4e1a\u52a1\u903b\u8f91 <\/p>\n

\u8fd4\u56de\u5904\u7406\u7ed3\u679c <\/p>\n

\u8f6c\u53d1\u6570\u636e <\/p>\n

\u6e32\u67d3\u54cd\u5e94\u9875\u9762 <\/p>\n

User <\/p>\n

Controller <\/p>\n

Model <\/p>\n

View <\/p>\n

\u4f8b\u9898<\/h4>\n

MVC\u53ea\u80fd\u7528Servlet\/JSP\u5b9e\u73b0（\u00d7）<\/p>\n

MVC\u662f\u4e00\u79cd\u8bbe\u8ba1\u6a21\u5f0f，\u53ef\u4ee5\u7528\u591a\u79cd\u6280\u672f\u5b9e\u73b0：<\/p>\n

    \n
  • Java：Spring MVC（Controller）+ JSP\/Thymeleaf（View）<\/li>\n
  • PHP：Laravel\u6846\u67b6<\/li>\n
  • JavaScript：Angular\/React+Vue（\u524d\u7aefMVC）<\/li>\n
  • Python：Django MTV\u6a21\u5f0f（\u672c\u8d28\u662fMVC\u53d8\u4f53）<\/li>\n<\/ul>\n

    \u5728MVC\u8bbe\u8ba1\u6a21\u5f0f\u4e2d，（ ）\u8d1f\u8d23\u63a5\u6536\u5ba2\u6237\u7684\u8bf7\u6c42\u6570\u636e A.JavaBean\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B.Servlet\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C.HTML\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D.JSP \u6b63\u786e\u7b54\u6848：B.Servlet \u89e3\u6790：<\/p>\n

      \n
    • Servlet\u662fJava Web\u4e2d\u6807\u51c6\u7684\u63a7\u5236\u5668\u7ec4\u4ef6<\/li>\n
    • \u73b0\u4ee3\u6846\u67b6\u4e2d\u53ef\u80fd\u662fSpring\u7684@Controller\u6216@RestController<\/li>\n
    • JSP（D）\u672c\u8d28\u5c5e\u4e8eView\u5c42，\u867d\u7136\u80fd\u63a5\u6536\u8bf7\u6c42\u4f46\u4e0d\u7b26\u5408MVC\u89c4\u8303<\/li>\n<\/ul>\n
      \n

      Servlet<\/h3>\n

      1. Servlet \u57fa\u7840\u6982\u5ff5<\/h4>\n

      Servlet（Server + Applet）\u662f\u8fd0\u884c\u5728 Web \u670d\u52a1\u5668（\u5982Tomcat） \u4e0a\u7684 Java\u7a0b\u5e8f，\u7528\u4e8e \u5904\u7406HTTP\u8bf7\u6c42\u5e76\u751f\u6210\u52a8\u6001\u54cd\u5e94\u3002<\/p>\n

        \n
      • \u6838\u5fc3\u4f5c\u7528：\n
          \n
        • \u63a5\u6536\u5ba2\u6237\u7aef（\u6d4f\u89c8\u5668）\u7684\u8bf7\u6c42（HttpServletRequest）\/\u63a5\u53d7\u5ba2\u6237\u7684\u8bf7\u6c42\u6570\u636e\u3002<\/li>\n
        • \u5904\u7406\u4e1a\u52a1\u903b\u8f91（\u5982\u67e5\u8be2\u6570\u636e\u5e93）\u3002<\/li>\n
        • \u8fd4\u56de\u54cd\u5e94（HttpServletResponse，\u5982HTML\/JSON）\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
          \n

          2. Servlet \u6838\u5fc3\u65b9\u6cd5<\/h4>\n\n\u65b9\u6cd5\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n
          init()<\/td>\nServlet\u521d\u59cb\u5316\u65f6\u8c03\u7528（\u4ec5\u4e00\u6b21）<\/td>\n<\/tr>\n
          service()<\/td>\n\u6839\u636e\u8bf7\u6c42\u7c7b\u578b（GET\/POST）\u8c03\u7528doGet()\u6216doPost()（\u7531\u5bb9\u5668\u81ea\u52a8\u5904\u7406）<\/td>\n<\/tr>\n
          doGet()<\/td>\n\u5904\u7406HTTP GET\u8bf7\u6c42<\/td>\n<\/tr>\n
          doPost()<\/td>\n\u5904\u7406HTTP POST\u8bf7\u6c42<\/td>\n<\/tr>\n
          destroy()<\/td>\nServlet\u9500\u6bc1\u65f6\u8c03\u7528（\u670d\u52a1\u5668\u5173\u95ed\u6216Servlet\u88ab\u79fb\u9664）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
          \n

          3. Servlet \u751f\u547d\u5468\u671f<\/h4>\n

          \u751f\u547d\u5468\u671f\u9636\u6bb5<\/h4>\n
        • \u52a0\u8f7d\u4e0e\u5b9e\u4f8b\u5316\n
            \n
          • Web\u5bb9\u5668（\u5982Tomcat）\u52a0\u8f7dServlet\u7c7b\u5e76\u8c03\u7528\u65e0\u53c2\u6784\u9020\u5668\u521b\u5efa\u5b9e\u4f8b\u3002<\/li>\n<\/ul>\n<\/li>\n
          • \u521d\u59cb\u5316（init()）\n
              \n
            • \u8c03\u7528init(ServletConfig config)\u65b9\u6cd5，\u4ec5\u6267\u884c\u4e00\u6b21（\u7528\u4e8e\u52a0\u8f7d\u8d44\u6e90）\u3002<\/li>\n<\/ul>\n<\/li>\n
            • \u5904\u7406\u8bf7\u6c42（service() \u2192 doGet()\/doPost()）\n
                \n
              • \u6bcf\u6b21\u8bf7\u6c42\u90fd\u4f1a\u8c03\u7528service()\u65b9\u6cd5，\u5e76\u6839\u636e\u8bf7\u6c42\u7c7b\u578b\u5206\u53d1\u5230doGet()\u6216doPost()\u3002<\/li>\n<\/ul>\n<\/li>\n
              • \u9500\u6bc1（destroy()）\n
                  \n
                • \u670d\u52a1\u5668\u5173\u95ed\u65f6\u8c03\u7528，\u91ca\u653e\u8d44\u6e90（\u5982\u6570\u636e\u5e93\u8fde\u63a5）\u3002<\/li>\n<\/ul>\n<\/li>\n
                  \n

                  4. \u8bf7\u6c42\u5904\u7406\u4e0e\u4f5c\u7528\u57df<\/h4>\n

                  request vs sendRedirect<\/h4>\n
                    \n
                  • request.setAttribute() + \u8f6c\u53d1（forward）\n
                      \n
                    • \u6570\u636e\u5728\u540c\u4e00\u4e2a\u8bf7\u6c42\u94fe\u4e2d\u5171\u4eab（\u53ef\u8de8Servlet\/JSP）\u3002<\/li>\n<\/ul>\n<\/li>\n
                    • response.sendRedirect()\n
                        \n
                      • \u53d1\u9001302\u91cd\u5b9a\u5411，\u65b0\u5efa\u8bf7\u6c42，\u539frequest\u4e2d\u7684\u6570\u636e\u4e22\u5931\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                        \n

                        5. \u8fc7\u6ee4\u5668（Filter）<\/h4>\n

                        \u8fc7\u6ee4\u5668\u7684\u4f5c\u7528<\/h4>\n
                          \n
                        • \u5728\u8bf7\u6c42\u5230\u8fbeServlet\u524d\u6216\u54cd\u5e94\u8fd4\u56de\u5ba2\u6237\u7aef\u524d\u6267\u884c\u9884\u5904\u7406（\u5982\u6743\u9650\u68c0\u67e5\u3001\u65e5\u5fd7\u8bb0\u5f55）\u3002<\/li>\n
                        • \u4e0eServlet\u7684\u533a\u522b：\n
                            \n
                          • Filter\u4e0d\u76f4\u63a5\u5904\u7406\u8bf7\u6c42，\u800c\u662f\u5bf9\u8bf7\u6c42\/\u54cd\u5e94\u8fdb\u884c\u8fc7\u6ee4\u3002<\/li>\n
                          • Servlet\u662f\u8bf7\u6c42\u7684\u6700\u7ec8\u5904\u7406\u8005\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                            \n

                            \u4f8b\u9898<\/h4>\n

                            Servlet\u7684doGet()\u548cdoPost()\u65b9\u6cd5\u7684\u4e24\u4e2a\u53c2\u6570\u7c7b\u578b\u662f：<\/p>\n

                              \n
                            • HttpServletRequest\u548cHttpServletResponse \u3002<\/li>\n<\/ul>\n
                              \n

                              Servlet\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u83b7\u53d6\u8bf7\u6c42\u53c2\u6570\u548c\u8df3\u8f6c\u9875\u9762\u3002（ \u221a ）<\/p>\n

                                \n
                              • \u6b63\u786e\u3002Servlet\u7684\u6838\u5fc3\u529f\u80fd\u662f：\n
                                  \n
                                • \u901a\u8fc7request.getParameter()\u83b7\u53d6\u8bf7\u6c42\u53c2\u6570\u3002<\/li>\n
                                • \u901a\u8fc7response.sendRedirect()\u6216RequestDispatcher\u5b9e\u73b0\u9875\u9762\u8df3\u8f6c\u3002<\/li>\n
                                • \u9664\u6b64\u4ee5\u5916，Servlet\u8fd8\u80fd\u5904\u7406\u4e1a\u52a1\u903b\u8f91\u3001\u751f\u6210\u52a8\u6001\u5185\u5bb9\u7b49\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                  \n

                                  JSP\u9875\u9762\u7684\u672c\u8d28\u4e5f\u662fServlet\u3002（ \u221a ）<\/p>\n

                                    \n
                                  • \u6b63\u786e\u3002JSP\u5728\u90e8\u7f72\u65f6\u4f1a\u88abWeb\u5bb9\u5668（\u5982Tomcat）\u7f16\u8bd1\u6210Servlet（Java\u7c7b）<\/li>\n<\/ul>\n
                                    \n

                                    \u7ed9\u5b9a\u4e0b\u9762HTML\u4ee3\u7801：<\/p>\n

                                    <<\/span>html<\/span>><\/span><\/span><<\/span>body<\/span>><\/span><\/span><<\/span>a<\/span> href<\/span>=<\/span>\u201d\/servlet\/MyServlet\u201d<\/span>><\/span><\/span>Click Me<\/<\/span>a<\/span>><\/span><\/span><\/<\/span>body<\/span>><\/span><\/span><\/<\/span>html<\/span>><\/span><\/span><\/p>\n

                                    \u5f53\u7528\u6237\u5355\u51fb\u201cCliick Me\u201d\u94fe\u63a5\u65f6，\u5c06\u8c03\u7528Servlet\u7684（ A ）\u65b9\u6cd5\u3002 A.doGet() B.doPost() C.Get() D.Post()<\/p>\n

                                      \n
                                    • \u6b63\u786e\u7b54\u6848：A. doGet()<\/li>\n
                                    • \u89e3\u6790：<a>\u6807\u7b7e\u9ed8\u8ba4\u53d1\u8d77\u7684\u662fHTTP GET\u8bf7\u6c42，\u56e0\u6b64\u4f1a\u8c03\u7528Servlet\u7684doGet()\u65b9\u6cd5\u3002POST\u9700\u8981\u901a\u8fc7<form method="post">\u89e6\u53d1\u3002<\/li>\n<\/ul>\n
                                      \n

                                      \u4e0b\u9762\u6709\u5173Servlet\u7684\u63cf\u8ff0\u9519\u8bef\u7684\u662f（ C ）\u3002 A.\u4e00\u4e2aServlet\u5c31\u662f\u4e00\u4e2aJava\u7c7b B.Servlet\u662f\u4f4d\u4e8eWeb\u670d\u52a1\u5668\u5185\u90e8\u7684\u670d\u52a1\u5668\u7aef\u7684Java\u5e94\u7528\u7a0b\u5e8f C.Servlet\u53ef\u4ee5\u7531\u5ba2\u6237\u7aef\u7684\u6d4f\u89c8\u5668\u89e3\u91ca\u6267\u884c D.\u52a0\u8f7dServlet\u7684Web\u670d\u52a1\u5668\u5fc5\u987b\u5305\u542b\u652f\u6301Servlet\u7684Java\u865a\u62df\u673a<\/p>\n

                                        \n
                                      • \u6b63\u786e\u7b54\u6848：C. Servlet\u53ef\u4ee5\u7531\u5ba2\u6237\u7aef\u7684\u6d4f\u89c8\u5668\u89e3\u91ca\u6267\u884c<\/li>\n
                                      • \u89e3\u6790：Servlet\u5728\u670d\u52a1\u5668\u7aef\u7531JVM\u6267\u884c，\u6d4f\u89c8\u5668\u53ea\u80fd\u63a5\u6536\u54cd\u5e94\u7ed3\u679c（\u5982HTML），\u65e0\u6cd5\u89e3\u91caServlet\u4ee3\u7801\u3002<\/li>\n<\/ul>\n
                                        \n

                                        Servlet\u7684\u751f\u547d\u5468\u671f\u7531\u4e00\u7cfb\u5217\u4e8b\u4ef6\u7ec4\u6210，\u628a\u8fd9\u4e9b\u4e8b\u4ef6\u6309\u5148\u540e\u987a\u5e8f\u6392\u5217，\u6b63\u786e\u7684\u662f（ B ）\u3002 A.\u52a0\u8f7d\u7c7b，\u5b9e\u4f8b\u5316，\u8bf7\u6c42\u5904\u7406，\u521d\u59cb\u5316，\u9500\u6bc1 B.\u52a0\u8f7d\u7c7b，\u5b9e\u4f8b\u5316，\u521d\u59cb\u5316，\u8bf7\u6c42\u5904\u7406，\u9500\u6bc1 C.\u5b9e\u4f8b\u5316，\u52a0\u8f7d\u7c7b，\u521d\u59cb\u5316，\u8bf7\u6c42\u5904\u7406，\u9500\u6bc1 D.\u52a0\u8f7d\u7c7b，\u521d\u59cb\u5316，\u5b9e\u4f8b\u5316，\u8bf7\u6c42\u5904\u7406，\u9500\u6bc1<\/p>\n

                                          \n
                                        • \u6b63\u786e\u7b54\u6848：B. \u52a0\u8f7d\u7c7b\u2192\u5b9e\u4f8b\u5316\u2192\u521d\u59cb\u5316\u2192\u8bf7\u6c42\u5904\u7406\u2192\u9500\u6bc1<\/li>\n
                                        • \u5173\u952e\u6b65\u9aa4：\n
                                        • \u5bb9\u5668\u52a0\u8f7dServlet\u7c7b（.class\u6587\u4ef6）\u3002<\/li>\n
                                        • \u5b9e\u4f8b\u521b\u5efa（\u8c03\u7528\u65e0\u53c2\u6784\u9020\u5668）\u3002<\/li>\n
                                        • \u521d\u59cb\u5316（\u8c03\u7528init()，\u4ec5\u4e00\u6b21）\u3002<\/li>\n
                                        • \u5904\u7406\u8bf7\u6c42（\u591a\u6b21\u8c03\u7528service()\u53cadoGet()\/doPost()）\u3002<\/li>\n
                                        • \u9500\u6bc1（\u8c03\u7528destroy()\u91ca\u653e\u8d44\u6e90）\u3002<\/li>\n<\/li>\n<\/ul>\n
                                          \n

                                          \u7ed9\u5b9a\u4e00\u4e2aServlet\u7684doGet()\u65b9\u6cd5\u4e2d\u7684\u4ee3\u7801\u7247\u6bb5，\u5982\u4e0b：<\/p>\n

                                          request.setAttribute(\u201cname\u201d,\u201d\u5f20\u4e09\u201d);
                                          \nresponse.sendRedirect(\u201chttp:\/\/localhost:8080\/helloweb\/my-servlet\u201d);<\/p>\n

                                          \u90a3\u4e48\u5728my-servlet\u4e2d\u53ef\u4ee5\u4f7f\u7528（ D ）\u65b9\u6cd5\u628a\u5c5e\u6027name\u7684\u503c\u53d6\u51fa\u6765\u3002<\/p>\n

                                          A.String name = request.getAttribute(\u201cname\u201d); B.String name = (String)request.getAttribute (\u201cname\u201d); C.Object name = request.getAttribute (\u201cname\u201d);Get() D.\u65e0\u6cd5\u53d6\u51fa\u6765<\/p>\n

                                            \n
                                          • \u6b63\u786e\u7b54\u6848：D. \u65e0\u6cd5\u53d6\u51fa\u6765<\/li>\n
                                          • \u89e3\u6790：\n
                                              \n
                                            • sendRedirect()\u662f\u5ba2\u6237\u7aef\u91cd\u5b9a\u5411（\u54cd\u5e94\u7801302），\u4f1a\u53d1\u8d77\u65b0\u7684\u8bf7\u6c42，\u539f\u8bf7\u6c42\u7684request\u5bf9\u8c61\u53ca\u5176\u5c5e\u6027\u5df2\u5931\u6548\u3002<\/li>\n
                                            • \u82e5\u9700\u4f20\u9012\u6570\u636e，\u53ef\u7528session\u6216\u8ffd\u52a0\u53c2\u6570\u5230URL（\u5982?name=\u5f20\u4e09）\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                              \n

                                              \u4ee5\u4e0b\u5173\u4e8e\u8fc7\u6ee4\u5668\u7684\u8bf4\u6cd5\u9519\u8bef\u7684\u662f（ D ）\u3002<\/p>\n

                                              A.\u662f\u5411Web\u5e94\u7528\u7a0b\u5e8f\u7684\u8bf7\u6c42\u548c\u54cd\u5e94\u5904\u7406\u6dfb\u52a0\u529f\u80fd\u7684Web\u670d\u52a1\u7ec4\u4ef6 B.Filter\u4e0d\u662f\u4e00\u4e2aServlet C.\u80fd\u591f\u5728\u4e00\u4e2a\u8bf7\u6c42request\u5230\u8fbeServlet\u4e4b\u524d\u9884\u5904\u7406request，\u5728\u79bb\u5f00Servlet\u65f6\u5904\u7406response D.Filter\u662f\u4e00\u4e2aServlet<\/p>\n

                                                \n
                                              • \u6b63\u786e\u7b54\u6848：D. Filter\u662f\u4e00\u4e2aServlet<\/li>\n
                                              • \u89e3\u6790：\n
                                                  \n
                                                • Filter\u4e0eServlet\u662f\u5e76\u5217\u6982\u5ff5，\u5747\u5b9e\u73b0\u7279\u5b9a\u63a5\u53e3，\u4f46\u804c\u8d23\u4e0d\u540c：<\/li>\n
                                                • Filter：\u9884\u5904\u7406\u8bf7\u6c42（doFilter()）\u3001\u540e\u5904\u7406\u54cd\u5e94\u3002<\/li>\n
                                                • Servlet：\u5904\u7406\u4e1a\u52a1\u903b\u8f91\u3002<\/li>\n
                                                • Filter\u9700\u5728web.xml\u6216\u6ce8\u89e3\u4e2d\u914d\u7f6eURL\u6620\u5c04\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                  \u7b80\u8ff0Servlet\u7684\u751f\u547d\u5468\u671f\u3002<\/p>\n

                                                • \u52a0\u8f7d\u548c\u5b9e\u4f8b\u5316：\u5bb9\u5668\u52a0\u8f7dServlet\u7c7b\u5e76\u521b\u5efa\u5b9e\u4f8b<\/li>\n
                                                • \u521d\u59cb\u5316：\u8c03\u7528init()\u65b9\u6cd5<\/li>\n
                                                • \u5904\u7406\u8bf7\u6c42：\u8c03\u7528service()\u65b9\u6cd5，\u6839\u636e\u8bf7\u6c42\u7c7b\u578b\u8c03\u7528doGet()\/doPost()<\/li>\n
                                                • \u9500\u6bc1：\u8c03\u7528destroy()\u65b9\u6cd5\u91ca\u653e\u8d44\u6e90<\/li>\n
                                                  \n

                                                  EL\u8868\u8fbe\u5f0f<\/h3>\n

                                                  \u83b7\u53d6\u8bf7\u6c42\u4f5c\u7528\u57dfrequest\u4e2d\u7684\u540d\u4e3a\u201cuname\u201d\u7684\u503c\u7684EL\u8868\u8fbe\u5f0f\u662f\u00a0 ${requestScope.name}\u6216\u8005${uname} \u89e3\u6790：<\/p>\n

                                                    \n
                                                  • ${requestScope.uname}：\u663e\u5f0f\u6307\u5b9a\u4ece\u00a0request\u00a0\u4f5c\u7528\u57df\u83b7\u53d6\u00a0uname\u00a0\u5c5e\u6027<\/li>\n
                                                  • ${uname}：EL \u8868\u8fbe\u5f0f\u4f1a\u6309\u7167\u00a0pageScope\u00a0\u2192\u00a0requestScope\u00a0\u2192\u00a0sessionScope\u00a0\u2192\u00a0applicationScope\u00a0\u7684\u987a\u5e8f\u81ea\u52a8\u67e5\u627e\u00a0uname<\/li>\n<\/ul>\n

                                                    \u5728\u4e00\u4e2aJSP\u9875\u9762\u4e2d，\u6709\u8868\u8fbe\u5f0f<%=\u20192\u2019+3 %>，\u5b83\u5c06\u8f93\u51fa（\u00a0 B\u00a0 ） A.2+3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B.53\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C.23\u00a0\u00a0\u00a0\u00a0\u00a0 D.\u4e0d\u4f1a\u8f93\u51fa，\u56e0\u4e3a\u8868\u8fbe\u5f0f\u662f\u9519\u8bef\u7684 \u89e3\u6790：<\/p>\n

                                                      \n
                                                    • '2'\u00a0\u662f\u4e00\u4e2a\u5b57\u7b26（ASCII \u7801\u503c\u4e3a 50），3\u00a0\u662f\u6570\u5b57，+\u00a0\u8fd0\u7b97\u4f1a\u5148\u63d0\u5347\u00a0'2'\u00a0\u4e3a ASCII \u7801\u503c（50），\u7136\u540e\u8ba1\u7b97\u00a050 + 3 = 53<\/li>\n
                                                    • \u5982\u679c\u5199\u6210\u00a0"2" + 3，\u5219\u8f93\u51fa\u00a0"23"（\u5b57\u7b26\u4e32\u62fc\u63a5）<\/li>\n<\/ul>\n

                                                      \u4f7f\u7528JSP\u811a\u672c\u5b9a\u4e49\u4e86\u53d8\u91cfa，\u5728\u9875\u9762\u4e2d\u8f93\u51faa\u7684\u6b63\u786e\u8868\u8fbe\u5f0f\u662f（ B ） A.<%=a;%>\u00a0\u00a0\u00a0\u00a0\u00a0 B.<%=a%>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C.<%==a;%>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D.<%a%> \u89e3\u6790：<\/p>\n

                                                        \n
                                                      • JSP \u8f93\u51fa\u8868\u8fbe\u5f0f\u00a0<%= … %>\u00a0\u4e0d\u80fd\u52a0\u5206\u53f7\u00a0;，\u56e0\u6b64\u00a0B\u00a0\u6b63\u786e<\/li>\n<\/ul>\n

                                                        \u5728JSP\u9875\u9762\u4e2d，\u4e0eEL\u8868\u8fbe\u5f0f${user.loginName}\u7b49\u4ef7\u7684\u662f（ A ） A.<%=user.getLoginName()%> B.<% user.getLoginName();%> C.<%=user.loginName()%> D.<% user.loginName;%> \u89e3\u6790：<\/p>\n

                                                          \n
                                                        • EL \u8868\u8fbe\u5f0f\u00a0${user.loginName}\u00a0\u4f1a\u81ea\u52a8\u8c03\u7528\u00a0user.getLoginName()\u00a0\u65b9\u6cd5（\u9075\u5faa JavaBean \u89c4\u8303）<\/li>\n
                                                        • A\u00a0\u6b63\u786e：\u663e\u5f0f\u8c03\u7528\u00a0getLoginName()<\/li>\n<\/ul>\n

                                                          \u8868\u8fbe\u5f0f\u8bed\u8a00\u4e2d\u53ef\u4f7f\u7528\u7684\u9690\u542b\u53d8\u91cf\u540d<\/p>\n

                                                          \n

                                                          \u4f5c\u7528\u57df<\/h3>\n

                                                          \u56db\u79cd\u4f5c\u7528\u57df\u5bf9\u8c61\u5bf9\u6bd4<\/h4>\n\n\u4f5c\u7528\u57df\u8303\u56f4\u751f\u547d\u5468\u671f<\/tr>\n\n\n\n\n\n
                                                          pageContext<\/td>\n\u5f53\u524dJSP\u9875\u9762<\/td>\n\u9875\u9762\u6267\u884c\u671f\u95f4<\/td>\n<\/tr>\n
                                                          request<\/td>\n\u4e00\u6b21\u8bf7\u6c42（\u53ef\u80fd\u542b\u591a\u6b21\u8f6c\u53d1）<\/td>\n\u8bf7\u6c42\u5f00\u59cb\u5230\u54cd\u5e94\u5b8c\u6210<\/td>\n<\/tr>\n
                                                          session<\/td>\n\u7528\u6237\u4f1a\u8bdd（\u6d4f\u89c8\u5668\u4e0d\u5173\u95ed）<\/td>\n\u4f1a\u8bdd\u521b\u5efa（\u9996\u6b21\u8bf7\u6c42）\u5230\u8d85\u65f6\u6216\u624b\u52a8\u5931\u6548<\/td>\n<\/tr>\n
                                                          application<\/td>\n\u6574\u4e2aWeb\u5e94\u7528（\u6240\u6709\u7528\u6237\u5171\u4eab）<\/td>\n\u5e94\u7528\u542f\u52a8\u5230\u505c\u6b62<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                          \u4f8b\u9898<\/h4>\n

                                                          \u8981\u5c06\u4e00\u4e2a\u540d\u4e3a\u201cstudent\u201d\u7684\u5bf9\u8c61student\u5b58\u50a8\u5728\u4f1a\u8bdd\u4f5c\u7528\u57df\u4e2d\u8bed\u53e5\u662f session.setAttribute("student",student)<\/p>\n

                                                          Session\u901a\u5e38\u60c5\u51b5\u4e0b\u5b58\u6d3b\u65f6\u95f4\u9ed8\u8ba4\u662f\u534a\u5c0f\u65f6（ \u221a ）<\/p>\n

                                                          \u5e94\u7528\u4f5c\u7528\u57df\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u53ef\u4ee5\u5728\u4f1a\u8bdd\u4f5c\u7528\u57df\u4e2d\u53d6\u51fa（ \u00d7 ）<\/p>\n

                                                          \u5982\u679c\u60f3\u8981\u5b9e\u73b0\u8d2d\u7269\u8f66\u529f\u80fd，\u5e94\u8be5\u4f7f\u7528\u4e0b\u9762\u54ea\u4e2a\u77e5\u8bc6\u70b9（ B ） A.Filter B.Session C.Response D.application \u89e3\u6790： \u8d2d\u7269\u8f66\u529f\u80fd\u9700\u8981\u8de8\u591a\u4e2a\u8bf7\u6c42\u4fdd\u5b58\u7528\u6237\u9009\u62e9\u7684\u5546\u54c1\u4fe1\u606f，\u800c Session（\u4f1a\u8bdd） \u662f\u6700\u9002\u5408\u7684\u673a\u5236：<\/p>\n

                                                        • \u4f1a\u8bdd\u7ea7\u5b58\u50a8：Session \u5728\u7528\u6237\u6574\u4e2a\u6d4f\u89c8\u671f\u95f4\u6709\u6548，\u9002\u5408\u4fdd\u5b58\u4e34\u65f6\u6570\u636e（\u5982\u8d2d\u7269\u8f66\u5546\u54c1）\u3002<\/li>\n
                                                        • \u7528\u6237\u9694\u79bb：\u6bcf\u4e2a\u7528\u6237\u7684 Session \u72ec\u7acb，\u907f\u514d\u6570\u636e\u6df7\u6dc6\u3002<\/li>\n
                                                        • \u5b89\u5168\u6027：Session \u6570\u636e\u5b58\u50a8\u5728\u670d\u52a1\u5668\u7aef，\u6bd4 Cookie \u66f4\u5b89\u5168\u3002 \u5176\u4ed6\u9009\u9879\u5206\u6790：<\/li>\n
                                                            \n
                                                          • A. Filter（\u8fc7\u6ee4\u5668）：\n
                                                              \n
                                                            • \u7528\u4e8e\u62e6\u622a\u8bf7\u6c42\/\u54cd\u5e94（\u5982\u6743\u9650\u63a7\u5236\u3001\u65e5\u5fd7\u8bb0\u5f55），\u4e0d\u6d89\u53ca\u6570\u636e\u5b58\u50a8\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                            • C. Response（\u54cd\u5e94\u5bf9\u8c61）：\n
                                                                \n
                                                              • \u7528\u4e8e\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u6570\u636e，\u65e0\u6cd5\u6301\u4e45\u5316\u8d2d\u7269\u8f66\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                              • D. Application（ServletContext）：\n
                                                                  \n
                                                                • \u5168\u5c40\u4f5c\u7528\u57df，\u6240\u6709\u7528\u6237\u5171\u4eab\u6570\u636e，\u4e0d\u9002\u5408\u5b58\u50a8\u7528\u6237\u79c1\u6709\u7684\u8d2d\u7269\u8f66\u6570\u636e\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                                                  \n

                                                                  \u8bf7\u6c42\u8f6c\u53d1（Forward）\u4e0e\u54cd\u5e94\u91cd\u5b9a\u5411（Redirect）\u5bf9\u6bd4<\/h3>\n

                                                                  \u76f8\u540c\u70b9：\u5747\u7528\u4e8e\u9875\u9762\u8df3\u8f6c，\u8df3\u8f6c\u903b\u8f91\u7531\u540e\u7aef\u4ee3\u7801\u51b3\u5b9a\u3002 \u4e0d\u540c\u70b9：<\/p>\n\n\u5bf9\u6bd4\u9879\u8bf7\u6c42\u8f6c\u53d1（Forward）\u54cd\u5e94\u91cd\u5b9a\u5411（Redirect）<\/tr>\n\n\n\n\n\n\n\n
                                                                  \u673a\u5236<\/td>\n\u670d\u52a1\u5668\u5185\u90e8\u8df3\u8f6c，\u5ba2\u6237\u7aef\u65e0\u611f\u77e5<\/td>\n\u670d\u52a1\u5668\u8fd4\u56de\u65b0\u5730\u5740，\u5ba2\u6237\u7aef\u91cd\u65b0\u53d1\u8d77\u8bf7\u6c42<\/td>\n<\/tr>\n
                                                                  URL \u53d8\u5316<\/td>\n\u6d4f\u89c8\u5668\u5730\u5740\u680f\u4e0d\u53d8<\/td>\n\u6d4f\u89c8\u5668\u5730\u5740\u680f\u53d8\u4e3a\u65b0\u5730\u5740<\/td>\n<\/tr>\n
                                                                  \u8bf7\u6c42\u6b21\u6570<\/td>\n1 \u6b21（\u670d\u52a1\u5668\u5185\u90e8\u5b8c\u6210\u8df3\u8f6c）<\/td>\n2 \u6b21（\u5ba2\u6237\u7aef\u5148\u8bf7\u6c42\u539f\u5730\u5740，\u518d\u8bf7\u6c42\u65b0\u5730\u5740）<\/td>\n<\/tr>\n
                                                                  \u6570\u636e\u5171\u4eab<\/td>\n\u5171\u4eab\u540c\u4e00\u4e2arequest\u4f5c\u7528\u57df<\/td>\n\u4e0d\u5171\u4eabrequest，\u901a\u8fc7session\u6216URL\u4f20\u9012<\/td>\n<\/tr>\n
                                                                  HTTP\u72b6\u6001\u7801<\/td>\n\u65e0\u7279\u6b8a\u72b6\u6001\u7801（\u5bf9\u5ba2\u6237\u7aef\u900f\u660e）<\/td>\n302（\u4e34\u65f6\u91cd\u5b9a\u5411） \u6216 301（\u6c38\u4e45\u91cd\u5b9a\u5411）<\/td>\n<\/tr>\n
                                                                  \u5728JSP\u9875\u9762\u4e2d，\u4f7f\u7528（ \u00a0\u00a0\u00a0\u00a0）\u5bf9\u8c61\u7684（\u00a0\u00a0\u00a0\u00a0 ）\u65b9\u6cd5\u5b9e\u73b0\u8bf7\u6c42\u8f6c\u53d1\u3002（ A ）<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                                                  A.request.getRequestDispatcher()<\/p>\n

                                                                  B. request.getRequestDispatcher().forward()<\/p>\n

                                                                  C.response.sendRedirect()<\/p>\n

                                                                  D.response.sendRequestDispatcher()<\/p>\n

                                                                  \u89e3\u6790： \u5728 JSP \u9875\u9762\u4e2d，\u8bf7\u6c42\u8f6c\u53d1（Forward） \u662f\u901a\u8fc7 request.getRequestDispatcher() \u83b7\u53d6\u5206\u53d1\u5668，\u518d\u8c03\u7528 forward() \u65b9\u6cd5\u5b9e\u73b0\u7684\u3002<\/p>\n

                                                                  \u6b63\u786e\u7528\u6cd5：<\/h5>\n

                                                                  request.<\/span>getRequestDispatcher<\/span>(<\/span>"\u76ee\u6807\u9875\u9762.jsp"<\/span>)<\/span>.<\/span>forward<\/span>(<\/span>request,<\/span> response)<\/span>;<\/span><\/p>\n

                                                                    \n
                                                                  • getRequestDispatcher()：\u83b7\u53d6\u8bf7\u6c42\u8f6c\u53d1\u5668（\u9009\u9879 A \u6b63\u786e）\u3002<\/li>\n
                                                                  • forward()：\u6267\u884c\u5b9e\u9645\u7684\u8f6c\u53d1\u64cd\u4f5c（\u4f46\u9898\u76ee\u95ee\u7684\u662f\u54ea\u4e2a\u65b9\u6cd5\u83b7\u53d6\u8f6c\u53d1\u5668，\u800c\u975e\u6267\u884c\u8f6c\u53d1）\u3002<\/li>\n<\/ul>\n

                                                                    \u5176\u4ed6\u9009\u9879\u5206\u6790：<\/p>\n

                                                                      \n
                                                                    • B. request.getRequestDispatcher().forward()：\n
                                                                        \n
                                                                      • \u8bed\u6cd5\u6b63\u786e，\u4f46\u9898\u76ee\u95ee\u7684\u662f\u83b7\u53d6\u8f6c\u53d1\u5668\u7684\u65b9\u6cd5，\u800c\u975e\u5b8c\u6574\u8c03\u7528\u94fe\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                                      • C. response.sendRedirect()：\n
                                                                          \n
                                                                        • \u7528\u4e8e\u91cd\u5b9a\u5411（Redirect），\u800c\u975e\u8f6c\u53d1（Forward）\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                                        • D. response.sendRequestDispatcher()：\n
                                                                            \n
                                                                          • \u65e0\u6b64\u65b9\u6cd5，\u5c5e\u4e8e\u5e72\u6270\u9879\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                                            \u9898\u76ee\u95ee\u7684\u662f\u5982\u4f55\u83b7\u53d6\u8bf7\u6c42\u8f6c\u53d1\u5668，\u56e0\u6b64\u6b63\u786e\u7b54\u6848\u662f A（request.getRequestDispatcher()）\u3002 \u82e5\u9898\u76ee\u95ee\u5982\u4f55\u6267\u884c\u8f6c\u53d1，\u5219\u9700\u8c03\u7528 forward() \u65b9\u6cd5（\u5982\u9009\u9879 B \u7684\u5b8c\u6574\u5199\u6cd5）\u3002<\/p>\n

                                                                            \u5173\u952e\u533a\u522b：<\/p>\n

                                                                              \n
                                                                            • \u8f6c\u53d1（Forward） \u2192 request.getRequestDispatcher().forward()<\/li>\n
                                                                            • \u91cd\u5b9a\u5411（Redirect） \u2192 response.sendRedirect()<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

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